Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (5): 576-583.doi: 10.11743/ogg20090507

Previous Articles     Next Articles

Tectonic intersection relationship between Dabashan and Micangshan in Zhenba area,southern Shaanxi Province

Pei Xianzhi1,2, Li Ruibao2, Ding Saping1,2, Liu Zhanqing2, Li Zuochen2, Feng Jianyun2, Sun Yu2, Zhang Yafeng2   

  1. 1. Key Lab of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an, Shaanxi 710054, China;
    2. College of Earth Science and Resources, Chang'an University, Xi'an, Shaanxi 710054, China
  • Received:2009-06-12 Online:2009-10-25 Published:2012-01-16

Abstract:

Typical superimposed fold structure occurs in the Zhengba region,southern Shaanxi Province,where the Micangshan and Dabashan structures intersect with each other.The nearly EW-NEE trending fold structures in Micangshan area and the nearly SN-NNE trending closed fold structures in Dabashan area are in traverse superimposition.The superimposed folds developed in the Sishang area show that the early E-W trending folds were superimposed and deformed by the late S-N trending folds,resulting in the nearly S-N occurrence of the regional strata.These folds were developed during J3-K1.However,the folding and deformation of the Micangshan area happened in the Late Jurassic(J3),a little earlier than that of the Zhenba area(the west segment of the sou-thern Dabashan Mountain),which happened during the Late Jurassic and Early Cretaceous(J3/K1).The intersection and deformation of Dabashan and Micangshan were resulted from superimposition of different tectonic systems during the Yanshanian intracontinental orogeny on the basis of the Indosinian collision orogeny.

Key words: tectonic intersection relationship, superimposed fold, intracontinental orogeny, Micangshan, Dabashan, Zhenba area in southern Shaanxi Province

CLC Number: